Detachable tread tire



m Hmm CH9 A 1 9 Lm E M N An m G M .H i C April 26, 1955 CLARENCE GRAMELSPACHER ATTORNEYS United States Patent cc 2,707,014

Patented Apr. 26, 1955 one another throughout the entire extent of their surface engagement.

The tread 11 may have a suitable number of metal or 2,707,014 5 clotllll fabric layers 18 placed therein to give added strength to t e tread and to resist eXpansion of the tread and re- DETACHABLE TREAD TIRE sist rupture and puncture.

Clarence U. Gramelspacher, Jasper mi The tread 11 has the s1de edges 19 and 20 thereof tapered downwardly to substantially feathered edges 21 Application September 26, 951 serial 243,325 and 22 respectwely. Thus the feathered edges of the tread conform substantially to the contour to the outer surface 1 Claim. (Cl. 152-475) of the casing 10 and provide a neat appearance.

To install the tread 11 on the casing 10, the casing is deflated sufficiently to permit encirclement of the This invention relates to automobile tires. 15 tread is properly centered on the casing, the casing is re n object of the invention is to provide an automobile inflated to expand it into engagement with the tread 11 tire in which the casing and the tread are separate eleand thereby hold the tread in position on the casing. ments so that the tread can be replaced on the casing It will be understood, of course, that the casing may and removed therefrom at the will of the owner. be either of the tubeless variety or a tube can be used It is also an object of the invention to provide an autowithin the casing. Also, puncture sealing material such mobile tire in accordance with the fore oing object Whereas semi-cured rubber, can be placed within the casing on in a tire set is provided constituting a plurality of tread the inner periphery thereof to provide for puncture-proofdesigns that can be selectively placed onto a common ness 0 the casing and for blowout resistance casing to meet varying road cond1t1ons, such as fair The tread 11 preferably has the feathered edges 21 weather driving, or mud, snow, and ice conditions. and 22 terminating in a semi-hard lubber 11p WhlCh Wlll It is another object of the invention to provide an autogrip the sidewall of the casing 10 and resist radial expanmembers with the tread being selectively removable from lifting of the edges of the tread as a result of the action the casing at the will of the owner, and wherein the exof centrifugal force during operation of the tire. pansion of the casing when filled with its normal com- In Figure 4 there is illustrated the use: of a wire 25 plement of air secures the tread onto the casing in the feathered edge 26 of the tread 11a to resist the It 15 another ob ect of the invention to provide an autoaction of centrifugal force on the edge of the tread and mobile me 111 accordance with the foregoing ob ect to prevent any radial expansion of the tread thus effecwherem means is provided between the tread and the castively locking it on the casmg 10a The wire 25 is in the ing to resist lateral movement of the tread on the Casing. form of an annulus embedded in the feathered edge of the It is another object of the invention to provide an autotread 1101. mobile tire in accordance with the foregoing objects Also, in Figures 4 and 5 the inner periphery of the wherein a fabric layer is provided in the tread member tread at the feathered edge is provided with an annular of the combination tread and casing to resist expansion projection 36 that is received in an annular recess 27 of the tread relative to the casing. provided in the casing 10a. This projection resists any Further objects and advantages will become apparent transverse or lateral movement of the tread relative to from the drawings and the following description. the casing, thus locking it to position on the casing.

In the drawings: In Figure 6 there is illustrated another modified form Figure 1 is a transverse cross-sectional view of a tire of the projection for locking the tread onto the casing incorporating the subject of this invention. against transverse movement. In Figure 6 the annular Figure 2 is a transverse cross-sectional view of a porprojections 28 and 29 are provided on the casing 10b tion of a tire like that of Figure 1 but illustrating a and are received in corresponding annular recesses in the different tread applied to the tire casing, the tread being tread 11b.

particularly adapted for mud roads. In Figure 2 there is illustrated a tread design 30 con- Figure 3 is a transverse cross-sectional view of a portion sisting of transversely extending ribs 31 which form mud of a tire like that of Figure l but illustrating another tread grippers or snow grippers for use under adverse weather applied to the tire casing, the tread being particularly conditions. In Figure 3 the tread is illustrated with :1 adapted for use on icy roads. series of sharp metal projections 33 which provide a igure 4 is a cross-sectional view of a portion of a tire nonskid surface for use on icy roads. like that of Figure 1 but having a nonextensible annu- From the foregoing description it is obvious that the larly arranged Wire placed in the tread near the terminous tread 11 of the tire of Figure 1 can be removed from edge thereof. the casing 10 and the tread of either Figures 2 or 3 Figure 5 is an enlarged cross-sectional view illustrating be replaced onto the casing 10. Thus an owner of an placement of the wire in the tread edge of Figure 4. automobile is capable of changing the tread on the tires Figure 6 is a transverse cross-sectional view of a porto meet varying road conditions. tion of a tire like that of Figure 1 but of a modified While the device disclosed and described therein illusform having projections to resist lateral movement betrates preferred forms of the invention, yet it will be tween the tread and the casing. understood that various modifications of the invention can In this invention the tire consists of a casing member be made without departing from the spirit of the inven- 10 and a tread member 11. The tread member is wholl tion, and that all modifications that follow within the independent of the casing and is removable from the casscope of the appended claim are intended to be included ing at the will of the owner. herein.

The casing 10 is provided with the usual beaded edges Having thus fully described my invention, what I 12 and 13 for engagement with a rim. The main wall 14 Claim F 116W and dfisl-Te to Secure as new y Letters of the casing 10 is of relatively uniform thickness between Patenfi 1S! the beads 12 and 13. This wall 14 is provided with the A comprlslng a Caslng haYlng a Substantially C desired number of fabric layers 15 to give the necessary culr outer Contour a crois'sectlonal Plane taken trans strength to the Wall of the casing 1 verse to the plane of the tire and having beaded edges for engagement with a tire rim said casing further hav- The tread 11 1s composed of a rubber body 16 that has a Suitable tread design 17 impressed therein. The mg a wall structure of relatively uniform thickness ex- P P Q 'Y of the tread engages Outer P p y 0f panded condition whereby to hold said tread on said casthe casing so that the tread and easing supportedly engage ing, said tread having side edge portions each tapering from a relatively thick portion to a substantially feathered edge engaging said casing at points positioned substantially diametrically opposite each of the beaded edges of said casing, said thick portions adjacent said feathered edges each including an annularly extending substantially inextensible wire embedded therein to resist radial expansion of the said edge portions, annular projections integral with the inner surface of said thick portions and extending around the wall of the tread and between said inext-ensible wire and said casing, an annular recesses in the casing for receiving said annular projections whereby said tread is interlocked with said casing.

References Cited in the file of this patent UNITED STATES PATENTS 

